Very simple trick when investing in stocks. Look for companies with great management. The better the management the more confident you can be of them making similar decisions that lead them to success in the first place. (doesn't always work - but worked so far for me).
Look for value in companies. Sometimes stupid news can open value in a company. i.e. $TSLA's recent downfall and bounce back.
Most this type of info is available from following sources: Google finance, Bloomberg, S&P Capital IQ, Seeking alpha, ...and believe it or not TWITTER.